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Class 12
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Ohm's law and resistance
Ohm's law and resistance
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1)
Which Law explains the following? At constant temperature the current flowing through a conductor is directly proportional to the potential difference between its ends.
Joule’s Law
Ohm’s Law
Boyle’s Law
Charle’s Law
2)
What does the current through a wire depend on?
Both resistance and potential difference.
The resistance of the wire.
The thickness of the wire.
The potential difference applied.
3)
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
9 v
36 v
0 v
18 v
4)
What is the shape of V v/s I graph for a linear resistor?
Parabola
Straight line
Hyperbola
None of these
5)
Which of the following represent ohm’s law?
Potential difference / current = Resistance
Current = Resistance × potential difference.
Current = Resistance / Potential difference
None of these
6)
What is the potential difference required to pass a current of 5A through a metallic rod of resistance 10Ω?
0.5V
0.05V
5V
50V
7)
Choose the correct statement from the alternatives?
All of them are true
The resistance of a material is independent of the current passing through it.
Resistance of a material is the measure of how much it opposes the passage of free electrons.
Every material has resistance.
8)
What is the resistor value in the given circuit?
200 Ω
1 k Ω
2 k Ω
4 k Ω
9)
Which one of the following is the resistivity of gold wire?
1.59 x 10¯⁸ Ωm
2.82 x 10¯⁸ Ωm
2.44 x 10¯⁸ Ωm
100 x 10¯⁸ Ωm
10)
If the voltage across a fixed value of resistance is increased five times, what will be the variation in current?
Remains fixed
Become doubled
Increases to a factor of five
Decreases to a factor of five
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Cite this Simulator:
amrita.olabs.edu.in,. (2013). Ohm's law and resistance. Retrieved 24 May 2018, from amrita.olabs.edu.in/?sub=1&brch=6&sim=22&cnt=39